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my first advice would be to get rid of it! It will soon outgrow your tank and probably kill everthing in it.

Yes your tetra needs to be kept in a bigger school, at least 8, but you have so many guppies I don't think you could add any more, IMO.

Perfection is not attainable, but if we chase perfection we can catch excellence.
Once you learn to quit, it becomes a habit. -Vince Lombardi
“Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are.” ― John WoodenSandy Hook Elementary......Lest We Forget
See my profile for my tanks and what fish I keep